{"id":5275,"date":"2022-08-27T15:55:56","date_gmt":"2022-08-27T10:25:56","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-nsurlconnection-asynchronously\/"},"modified":"2022-08-27T15:55:56","modified_gmt":"2022-08-27T10:25:56","slug":"solved-how-can-i-use-nsurlconnection-asynchronously","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-nsurlconnection-asynchronously\/","title":{"rendered":"[Solved] how can I use NSURLConnection Asynchronously?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-17487124\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"17487124\" data-parentid=\"17487063\" data-score=\"1\" data-position-on-page=\"3\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Block code is your friend. I have created a class which does this for you<\/p>\n<p>Objective-C Block code. Create this class here<\/p>\n<p>Interface class<\/p>\n<pre><code>#import &lt;Foundation\/Foundation.h&gt;\n#import \"WebCall.h\"\n\n@interface WebCall : NSObject\n{\n    void(^webCallDidFinish)(NSString *response);\n\n}\n\n@property (nonatomic, retain) NSMutableData *responseData;\n\n-(void)setWebCallDidFinish:(void (^)(NSString *))wcdf;\n\n-(void)webServiceCall :(NSString *)sURL_p : (NSMutableArray *)valueList_p : (NSMutableArray *)keyList_p;\n\n@end\n<\/code><\/pre>\n<p>Implementation class<\/p>\n<pre><code>#import \"WebCall.h\"\n#import \"AppDelegate.h\"\n@implementation WebCall\n\n@synthesize responseData;\n\n-(void)setWebCallDidFinish:(void (^)(NSString *))wcdf\n{\n    webCallDidFinish = [wcdf copy];\n}\n\n- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response\n{\n    NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;\n    int responseStatusCode = [httpResponse statusCode];\n\n    NSLog(@\"Response Code = %i\", responseStatusCode);\n    if(responseStatusCode &lt; 200 || responseStatusCode &gt; 300)\n    {\n        webCallDidFinish(@\"failure\");\n    }\n\n\n\n    [responseData setLength:0];\n}\n\n- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace\n{\n\n    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];\n}\n\n- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge\n{\n    [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];\n\n    [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];\n}\n\n- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data\n{\n    [responseData appendData:data]; \n}\n\n- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error\n{\n\n    NSLog(@\"WebCall Error: %@\", error);\n    webCallDidFinish(@\"failure\");\n}\n\n- (void)connectionDidFinishLoading:(NSURLConnection *)connection\n{\n\n        NSString *response = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];\n        response = [response stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];\n        webCallDidFinish(response);\n\n}\n\n-(void)webServiceCall :(NSString *)sURL_p : (NSMutableArray *)valueList_p : (NSMutableArray *)keyList_p\n{\n    NSMutableString *sPost = [[NSMutableString alloc] init];\n\n    \/\/If any variables need passed in - append them to the POST\n    \/\/E.g. if keyList object is username and valueList object is adam will append like\n    \/\/http:\/\/test.jsp?username=adam\n    if([valueList_p count] &gt; 0)\n    {\n        for(int i = 0; i &lt; [valueList_p count]; i++)\n        {\n            if(i == 0)\n            {\n                    [sPost appendFormat:@\"%@=%@\", [valueList_p objectAtIndex:i],[keyList_p objectAtIndex:i]];\n            }\n            else\n            {\n\n                    [sPost appendFormat:@\"&amp;%@=%@\", [valueList_p objectAtIndex:i], [keyList_p objectAtIndex:i]];\n            }\n        }\n    }\n\n\n    NSData * postData = [sPost dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:NO];\n    NSString * postLength = [NSString stringWithFormat:@\"%d\",[postData length]];\n\n\n\n    NSURL * url = [NSURL URLWithString:sURL_p];\n    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:5];\n    [request setValue:@\"application\/x-www-form-urlencoded\" forHTTPHeaderField:@\"Content-Type\"];\n    [request setHTTPMethod:@\"POST\"];\n    [request setValue:postLength forHTTPHeaderField:@\"Content-Length\"];\n    [request setHTTPBody:postData];\n\n    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];\n\n    if (theConnection)\n    {\n        self.responseData = [NSMutableData data];\n    }\n\n\n}\n\n@end\n<\/code><\/pre>\n<p>Then you to make this web call, you call it like this<\/p>\n<pre><code>     WebCall *webCall = [[WebCall alloc] init];\n\n\n        [webCall setWebCallDidFinish:^(NSString *response){\n\n            \/\/This method is called as as soon as the web call is finished\n\nNSString *trimmedString = [response stringByTrimmingCharactersInSet:\n                                   [NSCharacterSet whitespaceAndNewlineCharacterSet]];\n        if([trimmedString rangeOfString:@\"failure\"].location == NSNotFound)\n        {\n           \/\/Successful web call\n        }\n        else\n        {\n           \/\/If the webcall failed due to an error\n        }\n\n        }];\n\n\n        \/\/Make web call here\n        [webCall webServiceCall:@\"http:\/\/www.bbc.co.uk\/\" :nil :nil];\n<\/code><\/pre>\n<p>See the setWebCallDidFinish method, it will not be called until the webcall has finished. <\/p>\n<p>Hope that helps!!<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved how can I use NSURLConnection Asynchronously? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Block code is your friend. I have created a class which does this for you Objective-C Block code. Create this class here Interface class #import &lt;Foundation\/Foundation.h&gt; #import &#8220;WebCall.h&#8221; @interface WebCall : NSObject { void(^webCallDidFinish)(NSString *response); } @property (nonatomic, retain) NSMutableData *responseData; -(void)setWebCallDidFinish:(void (^)(NSString *))wcdf; -(void)webServiceCall :(NSString *)sURL_p : (NSMutableArray *)valueList_p : (NSMutableArray *)keyList_p; @end &#8230; <a title=\"[Solved] how can I use NSURLConnection Asynchronously?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-nsurlconnection-asynchronously\/\" aria-label=\"More on [Solved] how can I use NSURLConnection Asynchronously?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1305,470],"class_list":["post-5275","post","type-post","status-publish","format-standard","hentry","category-solved","tag-nsurlconnection","tag-objective-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] how can I use NSURLConnection Asynchronously? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-use-nsurlconnection-asynchronously\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] how can I use NSURLConnection Asynchronously? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Block code is your friend. I have created a class which does this for you Objective-C Block code. Create this class here Interface class #import &lt;Foundation\/Foundation.h&gt; #import &quot;WebCall.h&quot; @interface WebCall : NSObject { void(^webCallDidFinish)(NSString *response); } @property (nonatomic, retain) NSMutableData *responseData; -(void)setWebCallDidFinish:(void (^)(NSString *))wcdf; -(void)webServiceCall :(NSString *)sURL_p : (NSMutableArray *)valueList_p : (NSMutableArray *)keyList_p; @end ... 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